JP7130440B2 - Overtilt correction device for elevating scaffolding - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating scaffolding capable of elevating a working floor.

2. Description of the Related Art Temporary scaffolding is conventionally provided along a building, for example, in building construction, and is used as a work floor during high-place work. In recent years, as a temporary scaffold, an elevating scaffold has been proposed in which a work floor can be vertically moved (see, for example, Patent Document 1).

Among the elevating scaffolds, there is known one that includes, for example, two masts, and a scaffolding section having a working floor is connected between the masts, and the scaffolding section moves up and down while maintaining a substantially horizontal state. there is That is, the elevating scaffolding has, for example, two masts arranged side by side on the ground at a predetermined interval, and each mast is provided with an elevating section that can slide along the masts. Each lifting section is lifted and lowered by, for example, a rotational drive of a motor. The scaffolding portion is provided so as to connect both the elevating portions and extends in the lateral direction of each elevating portion.

According to this elevating scaffolding, each elevating section is elevated at the same timing, so that the scaffolding section ascends and descends while maintaining a substantially horizontal position. As a result, when the scaffold rises to a predetermined height, a worker on the scaffold can perform high-place work at that height.

However, in this elevating scaffolding, each elevating unit is lifted and lowered by rotational driving of a motor, so if there is a variation in the rotational speed of each motor, the scaffolding may tilt in any direction. When the scaffold is tilted, there is a risk that the work of a worker on the scaffold will be hindered, or that tools and the like used for work at height will fall from the scaffold.

Therefore, in this elevating scaffolding, each motor is provided with an encoder for detecting the height position of each elevating unit, and when the height positions of both elevating units deviate, that is, when the scaffolding is tilted, either By temporarily stopping the rotation of the motor, the scaffolding is made substantially horizontal, and the horizontal state of the scaffolding is maintained when the scaffolding is raised and lowered.

However, encoders for detecting the height position of each lifting section are generally expensive, and the conventional lifting type scaffolding has the problem of increasing the cost of the entire apparatus. In addition, in the conventional elevating scaffolding, it is necessary to use a sequencer or the like in order to control the deviation of the height position detected by the encoder, which is also one of the causes of cost increase.

Japanese Patent No. 5783351

The present invention has been conceived under the circumstances described above, and provides an overtilt correction device for a lifting scaffolding that is simple in construction and low in cost and corrects excessive tilting of a work floor during lifting and lowering. The task is to provide

The overtilt correction device for a lifting type scaffold provided by the present invention comprises a first mast section and a second mast section erected at a predetermined interval, and a movable mast section movable along each of the mast sections. An elevating scaffold comprising a first moving part, a second moving part, and a carrier part supported so as to span between the moving parts and on which a worker rides, wherein each mast part a plurality of detected objects provided at regular intervals in the vertical direction; detecting means provided in each of the moving parts for detecting the position of one of the detected objects; When the carriage section moves up and down from a substantially horizontal state, the carriage section continues to move up and down in a state in which each of the detection means detects the object to be detected at the same time, and one of the detection means detects the object to be detected. and movement control means for temporarily stopping the movement of the moving part provided with the detection means when any one of the bodies is detected.

In the overtilt correction device for a lifting type scaffolding of the present invention, the movement control means temporarily stops the movement of the one moving part, and then the one of the detection means detects any one of the detection objects. is detected, the movement of the one moving part may be restarted.

The overtilt correction device for a lifting type scaffolding according to the present invention comprises a first drive mechanism and a second drive mechanism for moving each of the moving parts in the vertical direction, and the two drive mechanisms are each powered by a power tool. may be driven by

In the overtilt correction device for a lifting type scaffolding of the present invention, it is preferable that the detecting means is a limit switch, and the object to be detected is a dog.

According to the present invention, when the detection means (for example, the first limit switch) detects any of the objects to be detected (for example, the dog) during the lifting and lowering of the carrier section, the first moving device provided with the first limit switch Temporarily stop the movement of the part. In this case, the movement of the second moving part provided with other detection means (for example, a second limit switch) continues, so that the carriage part gradually returns to a horizontal state, preventing excessive tilting of the carriage part. can be corrected. As described above, according to the present invention, it is possible to correct an excessive inclination of the carriage part with a simple configuration such as a limit switch and a dog at low cost, and at the same time, there is no need to use a control device such as a sequencer, thereby reducing the cost. reduction can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the raising/lowering type scaffolding to which the overtilt correction apparatus which concerns on this invention is applied, (a) is a top view, (b) is a front view, (c) is a side view. It is a perspective view which shows the carrier support mechanism of the raising/lowering scaffold shown in FIG. It is a figure which shows the state which the electric screwdriver was joined to the gearbox. FIG. 4 is a perspective view of a column and an enlarged perspective view of a main part; It is a perspective view of a carrier part and a carrier support mechanism. It is a perspective view which shows the positional relationship of a limit switch and a dog. It is a figure which shows a movement control part and the apparatus structure connected to it. 4 is a sequence diagram showing an electrical connection configuration of a movement control unit; FIG. It is a figure which shows the positional relationship of each limit switch and a dog when a carrier part inclines. It is a timing chart figure which shows control of a movement control part.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

1A and 1B are diagrams showing an elevating scaffold to which an overtilt correction device according to the present invention is applied, wherein (a) is a plan view, (b) is a front view, and (c) is a side view. 2 is a perspective view showing a carrier support mechanism of the lifting scaffold shown in FIG. 1. FIG. In addition, in the following description, members having a common configuration are denoted by the same reference numerals.

This elevating scaffolding is used, for example, when repairing the exterior surface of a building, and is particularly of the elevating type in which the working floor is raised and lowered. As shown in FIG. 1, the elevating scaffold consists of a pair of first and second mast sections 1 and 2 arranged at a predetermined interval, and a pair of second mast sections for supporting the respective mast sections 1 and 2, respectively. 1 base portion 3 and second base portion 4, a pair of first moving portion 5 and second moving portion 6 vertically movable along each mast portion 1 and 2, and both moving portions 5 and 6 It is roughly configured by a carrier section 7 that is supported so as to be bridged.

In this elevating scaffolding, a worker who performs work gets on the carrier section 7, and the carrier section 7 is lifted and lowered along the first and second mast sections 1 and 2 by the first and second moving sections 5 and 6, respectively. be moved. Thereby, the worker can work at a suitable height position. The first and second mast sections 1 and 2, the first and second base sections 3 and 4, and the first and second moving sections 5 and 6 are configured in the same manner. When only the configuration of is described, the configuration of the other is assumed to be the same unless otherwise specified.

The first and second mast sections 1 and 2 each consist of a plurality of struts 8 which are sequentially connected to extend vertically. The connection between the pillars 8 is performed by a worker riding on the carrier section 7, thereby enabling the worker to adjust the heights of the first and second mast sections 1 and 2 to desired heights. . Details of the strut 8 will be described later.

The first and second base parts 3, 4 are provided with a base frame 9 for supporting the struts 8, as shown in FIG. The base frame 9 is composed of a frame formed in a substantially rectangular shape in a plan view, and has a plurality of support supports 10 for supporting the supports 8 on its upper surface.

Four outriggers 11 arranged to extend radially are connected to four corners of the base frame 9 . The outrigger 11 is for stably holding this elevating scaffolding on the ground (ground), and a jack member 12 capable of adjusting the height of the outrigger 11 is provided at the tip thereof. The mounting direction of the outrigger 11 with respect to the base frame 9 can be changed within a predetermined angular range.

A jack member 12 is also provided in the center of the base frame 9 in the longitudinal direction. Casters 13 are provided on the lower surface side of the base frame 9, for example, for a worker to manually move the elevating scaffold, and each caster 13 is provided with a stopper.

The first and second moving parts 5 and 6 are for supporting the carrier part 7 and moving it up and down. It has The moving plate 14 is slidably arranged along the side surface of the column 8, and a support member 15 for supporting the carrier section 7 is connected to the lower front portion thereof. The support member 15 has a length slightly larger than the widthwise length of the carrier part 7, and a locking piece 16 for locking the main body of the carrier part 7 so as to be rolled up can be attached to the tip thereof. provided for.

A gear box 17 is attached to the front upper portion of the moving plate 14 . The gear box 17 has a plurality of gears (not shown) inside, and as will be described later, the rotational movement of the electric driver D connected to the gear box 17 is performed to raise and lower the first and second moving parts 5 and 6. It converts it into an advancing motion in a direction.

As shown in FIG. 3 , a driver receiver 18 is provided on the upper surface of the gear box 17 , and a rotating shaft of an electric driver D is joined to the driver receiver 18 by an operator. A power supply voltage of AC 100 V, for example, is supplied to the electric driver D, and a movement control unit 31, which will be described later, is interposed in the middle of the supply. The movement control unit 31 controls power supply to the electric driver D on and off.

As shown in FIG. 4, the pillars 8 are formed in a substantially prismatic shape having a predetermined length. In the elevating scaffolding of the present embodiment, a plurality of pillars 8 are sequentially connected upward and stacked to be used. . Four side surfaces of the column 8 are respectively formed with recesses extending in the vertical direction, and a long plate-shaped track 20 is fitted to one of the four side surfaces on the front side. A plurality of engagement holes 21 are formed in the track 20 along the longitudinal direction.

Gears of the gear box 17 described above are engaged with the engagement holes 21 of the track 20 . That is, when the gears of the gear box 17 are fitted in the engagement holes 21 and rotated by the rotating operation of the electric screwdriver D, the moving plate 14 is vertically moved along the column 8, thereby moving the first and second The second moving parts 5 and 6 are vertically moved. It should be noted that the arrangement of gearbox 17 and track 20 of strut 8 functions as the first and second drive mechanisms described in the claims .

4, connection levers 22 for connecting other supports 8 are provided at the upper ends of the left and right sides of the support 8. As shown in FIG. The connecting lever 22 is connected to a lever lock (not shown) provided at the lower end of the upper column 8 when the upper end of the lower column 8 and the lower end of the upper column 8 are joined together, whereby the upper column 8 is It is connected to the support 8 below. Four recesses 23 are formed in the vicinity of the corners of the upper surface of the support 8, into which projections (not shown) formed at the lower ends of other supports 8 are fitted.

As shown in FIG. 5, the carrier section 7 is formed in an elongated shape, and includes a work floor 24 for the worker to stand on, and a work floor 24 arranged around the work floor 24 to prevent the worker from falling. and a handrail 25. The carrier section 7 is placed on the upper surfaces of the support members 15 of the first and second moving sections 5 and 6 arranged in parallel. 5 is locked by a locking piece 16 of a support member 15, and the depth side is locked to the support member 15 using a locking piece (not shown).

The work floor 24 and the handrail 25 are composed of a plurality of members, and by combining them, the carrier section 7 can be assembled independently of the carrier support mechanism shown in FIGS. 2 and 5, for example. The material of each member constituting the carrier section 7 and the like is, for example, an aluminum alloy, thereby reducing the weight of the carrier section 7 .

Next, the configuration of the tilt correction device, which is a feature of this embodiment, will be described. This tilt correction device is for correcting the tilted state of the carriage portion 7 so that it becomes substantially horizontal when it is moved up and down. As will be described later, the tilt correction device includes a first limit switch 25 and a second limit switch 26 provided on each of the moving plates 14 of the first and second moving parts 5 and 6, and a plurality of switches provided on each support 8. dog 28 and a movement control unit 31 .

The first and second limit switches 25 and 26 detect the position of one of the dogs 28 in order to detect the tilted state of the carrier section 4 . FIG. 6 is a perspective view showing the positional relationship between the first limit switch 25 and the dog 28. The first limit switch 25 is provided on the side surface of the moving plate 14 and faces the dog 28 provided on each post 8. are arranged to The second limit switch 26 has the same configuration as the first limit switch 25 .

In the first limit switch 25, an actuator portion 27 as a detection body is vertically rotatable in an arc shape. The first limit switch 25 is turned on when the actuator portion 27 is brought into contact with one of the dogs 28 attached to the column 8 side. The first limit switch 25 outputs an a-contact signal and a b-contact signal to the movement control section 31 when turned on.

The dog 28 functions as an object to be detected by the first limit switch 25 and, as shown in FIG. 6, has a substantially trapezoidal shape when viewed from the side. A plurality of dogs 28 are provided at regular intervals on an extension piece 29 extending vertically and flush with one side surface of each support 8 . This distance may be, for example, any value within the range of approximately 100 to 300 mm, preferably approximately 200 mm. The interval between the dogs 28 is set in advance so that it will be the same even when the support 8 and another support 8 are connected.

With the above configuration, when the moving plate 14 moves along the column 8, the actuator portion 27 of the first limit switch 25 comes into contact with one of the dogs 28 regardless of whether the direction is upward or downward, and the first limit switch 25 is turned on. Operate.

FIG. 7 is a diagram showing the configuration of the movement control unit 31 and devices connected thereto. The movement control section 31 receives output signals from the first and second limit switches 25 and 26 . The movement control unit 31 receives power supply voltages independently from two main power supplies, and the power supply voltages are supplied to the two electric drivers D via the two first electromagnetic switches 33 and the second electromagnetic switches 34. supplied respectively. The first and second electromagnetic switches 33, 34 permit or block the supply of power supply voltage.

Further, the movement control unit 31 has a timer T. The timer T is turned off after the first and second limit switches 25 and 26 are turned on, and is turned off after the first and second limit switches 25 and 26 are turned on, until the initial state is reached. and outputs three a-contact signals (details will be described later).

FIG. 8 is a sequence diagram showing the electrical connection configuration of the movement control section 31 including the first and second limit switches 25 and 26. As shown in FIG. In the movement control unit 31, the b contact of the first limit switch 25 (see "LS1" in FIG. 8) and the a contact of the timer T are connected to the relay (see "R1" in FIG. 8) of the first electromagnetic switch 33. It is connected. In addition, the b-contact of the second limit switch 26 (see "LS2" in FIG. 8) and the a-contact of the timer T are connected to the relay (see "R2" in FIG. 8) of the second electromagnetic switch 34. . Furthermore, the a-contacts of the first and second limit switches 25 and 26 are connected in series to the timer T, and its own a-contact is also connected.

Next, the operation of the overtilt correction device will be described mainly with reference to FIGS. 9 and 10. FIG. FIG. 9 is a diagram showing the positional relationship between the first and second limit switches 25 and 26 and the dog 28 when the carrier section 7 is tilted, and FIG. 10 is a timing chart showing the control of the movement control section 31. be.

In this elevating scaffolding, two workers ride on the carrier section 7, are positioned near the first and second moving sections 5 and 6, and operate the electric drivers D connected to the gear boxes 17, respectively. When both electric drivers D are rotationally driven, the rotational driving force is applied to the gears in the gear box 17, and since the gears are fitted in the engagement holes 21 of the post 8, the moving parts 5 and 6 are moved. By moving in the vertical direction, the carrier part 7 is moved up and down.

At this time, the moving speeds of the moving parts 5 and 6 may differ due to variations in the rotational driving force of the two electric drivers D, and the carrier part 7 may tilt. For example, when the carriage portion 7 is ascending and tilts such that the first moving portion 5 side is higher than the second moving portion 6 side, the first limit switch 25 moves ahead of the second limit switch 26 as shown in FIG. abuts on one of the dogs 28 at . As a result, the first limit switch 25 is turned on.

When the first limit switch 25 is turned on, the b contact of the first limit switch 25 opens (see FIG. 8), thereby cutting off the operating voltage (for example, 24 VDC) to the relay R1 of the first electromagnetic switch 33. Therefore, the first electromagnetic switch 33 is opened (see FIGS. 10(a) and 10(c)). Therefore, the power supply to the electric driver D on the first moving part 5 side is temporarily stopped, and the lifting of the carrier part 7 on the first moving part 5 side is stopped. In this case, since power supply to the electric driver D on the side of the second moving section 6 is continued, the carrier section 7 gradually approaches the horizontal state.

After that, the second limit switch 26 contacts the dog 28 this time, and the second limit switch 26 is turned on. When the second limit switch 26 is turned on, the b contact of the second limit switch 26 opens (see FIG. 8), and the operating voltage to the relay R2 of the second electromagnetic switch 34 is cut off.

At this time, since both the first and second limit switches 25 and 26 are ON, the a-contacts of both limit switches 25 and 26 are closed, thereby starting the timer T (FIG. 8). and FIG. 10(e)). Since the timer T is an off-delay timer that outputs an a-contact signal, the operation of the timer T supplies operating voltage to the relay R1 of the first electromagnetic switch 33 and the relay R2 of the second electromagnetic switch 34 . Therefore, while the first electromagnetic switch 33 is closed (see FIG. 10(c)), the second electromagnetic switch 34 continues to be closed (see FIG. 10(d)).

Therefore, the two electric drivers D are both supplied with the power supply voltage, and the carrier section 7 rises in a substantially horizontal state. When the supply of power supply voltage is continued, the first and second limit switches 25 and 26 get over the dog 28 and both are turned off. In this case, the ON operation time of the timer T is set to be longer than the time t from the time when the carriage portion 7 comes into contact with the carriage portion 7 to the time it climbs over the dog 28 (see FIG. 10(b)). Therefore, even if the operating time of the timer T expires, the first and second limit switches 25, 26 have already returned to the off state, so the operating voltage is supplied to the relays R1, R2, that is, the first and second The second electromagnetic switches 33 and 34 continue to be closed, and both electric drivers D are supplied with power supply voltage.

Thereafter, in the same way, the movement of one of the moving parts provided with the one limit switch that has come into contact with the dog 28 first is stopped, and the movement of the other moving part is continued, whereby the carrier part During the lifting and lowering of 7, the tilt is corrected.

Such control is performed in the same way when the carrier section 7 descends. That is, when the carriage portion 7 is inclined while descending, one of the limit switches on the lower side comes into contact with the dog before the other limit switch on the higher side, The rotation of the power supply driver D of one of the moving parts is stopped. As a result, even when the carriage portion 7 is lowered, the carriage portion 7 is lowered while maintaining a substantially horizontal state by correcting the excessive inclination of the carriage portion 7 .

As described above, according to the present embodiment, it is possible to correct excessive inclination of the carriage portion 7 during lifting and lowering with a simple configuration of the limit switch and the dog at low cost. In this case, there is no need to use a sequencer or the like for controlling deviation in detection of height by an encoder as in the conventional configuration, so cost reduction can be achieved.

The scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, the shape, size, quantity, and the like of each component of the overtilt correction device in the above embodiment are not limited to those in the above embodiment, and can be appropriately changed in design. For example, in the present embodiment, a limit switch and a dog are used as a configuration for detecting the tilted state of the carrier section 7. However, the configuration is not limited to this, and a non-contact photoelectric sensor or the like may be used.

Further, in the above embodiment, the detected inclination angle of the carrier part 7 depends on the interval between the dogs 28. Therefore, for example, another post with a different arrangement interval between the dogs 28 is prepared, and if necessary, another post is prepared. may be used in place of Alternatively, other extending pieces having dogs 28 arranged at different intervals may be used.

1 first mast part 2 second mast part 3 first base part 4 second base part 5 first moving part 6 second moving part 7 carrier part 8 column 14 moving support 15 support member 17 gear box 25 first limit switch 26 Second limit switch 28 Dog 31 Movement control unit D Electric screwdriver

Claims (4)

a first mast section and a second mast section erected at a predetermined interval;
a first moving part and a second moving part respectively movable along the two masts;
An elevating scaffold comprising a carrier part supported so as to span between the moving parts and on which a worker rides,
a plurality of objects to be detected provided at equal intervals in the vertical direction on each mast;
a detecting means provided in each of the moving parts for detecting the position of any one of the detected objects;
When the carriage part is moved up and down from a substantially horizontal state by the movement of both the moving parts, in a state in which the respective detection means simultaneously detect the object to be detected, the carriage part continues to be raised and lowered,
movement control means for temporarily stopping the movement of the moving part provided with the detection means when any one of the detection means detects any of the objects to be detected;
An overtilt correction device for a lifting scaffold, comprising: The movement control means is
After temporarily stopping the movement of the one moving part,
2. The overtilt correction device for a lifting type scaffolding according to claim 1, wherein when one of said detecting means detects one of said objects to be detected, movement of said one moving part is resumed. A first drive mechanism and a second drive mechanism for moving each of the moving parts in the vertical direction,
3. The overtilt correction device for a lift-type scaffolding according to claim 1, wherein both of said driving mechanisms are driven by a rotational force of an electric power tool. The detection means is a limit switch,
4. The overtilt correction device for an elevating scaffold according to claim 1, wherein said object to be detected is a dog.

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